Is There an Ideal Level of Platelet P2Y₁₂-Receptor Inhibition in Patients Undergoing Percutaneous Coronary Intervention?: “Window” Analysis From the ADAPT-DES Study (Assessment of Dual AntiPlatelet Therapy With Drug-Eluting Stents)

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• 作者：Ajay J. Kirtane ; MD ; SM^&lowast ; ; ^&dagger ; ; ^{akirtane@columbia.edu" class="auth_mail" title="E-mail the corresponding author} ; Puja B. Parikh ; MD^&lowast ; ; Thomas D. Stuckey ; MD^&Dagger ; ; Ke Xu ; PhD^&dagger ; ; Bernhard Witzenbichler ; MD^§ ; ; Giora Weisz ; MD^&lowast ; ; ^&dagger ; ; ^‖ ; Michael J. Rinaldi ; MD^¶ ; ; Franz-Josef Neumann ; MD^# ; D. Christopher Metzger ; MD^&lowast ; &lowast ; ; Timothy D. Henry ; MD^&dagger ; &dagger ; ; ^&Dagger ; &Dagger ; ; David A. Cox ; MD^§ ; § ; ; Peter L. Duffy ; MD ; MMM^‖‖ ; Bruce R. Brodie ; MD^&Dagger ; ; Ernest L. Mazzaferri Jr. ; MD^¶ ; ¶ ; ; Rupa Parvataneni ; MS^&dagger ; ; Akiko Maehara ; MD^&lowast ; ; ^&dagger ; ; Philippe Gé ; né ; reux ; MD^&lowast ; ; ^&dagger ; ; ^## ; Roxana Mehran ; MD^&dagger ; ; ^&lowast ; &lowast ; &lowast ; ; Gregg W. Stone ; MD^&lowast ; ; ^&dagger ;
• 关键词：hemorrhage ; platelets ; stent(s) ; thrombosis
• 刊名：JACC: Cardiovascular Interventions
• 出版年：2015
• 出版时间：28 December 2015
• 年：2015
• 卷：8
• 期：15
• 页码：1978-1987
• 全文大小：844 K

文摘

This study sought to determine whether there is an ideal level of platelet reactivity (PR) to optimize safety and efficacy within the large multicenter ADAPT-DES (Assessment of Dual AntiPlatelet Therapy With Drug-Eluting Stents) study of 8,582 patients receiving successful drug-eluting stent implantation.

Background

Patients with high PR on clopidogrel have a greater incidence of adverse ischemic events after stent implantation, whereas low PR may increase bleeding. Due to limited sample size, previous studies have not been able to adjust for differences in baseline characteristics that may confound the relationship of PR and outcomes.

Methods

In the ADAPT-DES study, routine platelet function testing (VerifyNow) was performed following clopidogrel loading. To characterize the independent association between PR and clinical events, patients were stratified into quintiles of P2Y₁₂ reaction units (PRU).

Results

The PRU medians of the 5 quintiles were 57, 130, 187, 244, and 317 (most to least inhibited). There was a monotonic association between successively higher PRU quintiles and stent thrombosis, whereas for clinically relevant bleeding, the greatest risk occurred in the lowest PRU quintile, with similar risks across the 4 higher quintiles. These relationships remained significant in fully adjusted multivariable analyses (adjusted hazard ratio [HR] for stent thrombosis in Q5 versus Q1: 2.32; 95% confidence interval [CI]: 1.17 to 4.59; p = 0.02; adjusted HR for clinically relevant bleeding in Q5 versus Q1: 0.61; 95% CI: 0.47 to 0.77; p < 0.001). However, there were no significant independent associations between the level of PRU and mortality.

Conclusions

In this large observational study, increasing PRU was associated with a monotonic increase in stent thrombosis, whereas bleeding risk was confined to the lowest PRU quintile, suggesting an optimal therapeutic window of platelet inhibition at moderately inhibited PRU. However, there was no demonstrable threshold effect for PRU and mortality in adjusted analyses, perhaps due to the offsetting impact of bleeding and ischemia across the spectrum of platelet inhibition. (Assessment of Dual AntiPlatelet Therapy With Drug-Eluting Stents [ADAPT-DES]; NCT00638794)